Friction-clutch.



N0.782,9a5. v f PATENTBDFBB-21, 1905. A. P. OLSON.

FRIGTION GLUTGH.

APPLICATION FILED SEPT. 25. 1903.

Patented February 21, 1905.

PATENT OEEICE.

ANDREV P. OLSON, OF CHICAGO, ILLINOIS.

FRlCTlON-CLUTCH.

SPECIFICATION'formingpart of Letters Patent No. 782,985, dated February21, 1905.

Application tied september 25, 190s. serial No. 174,550.

.To a/Z 1071/0771/ vit puny concern.' Beit known'that LANDREW P. OLSON,of Chicago, in the State of Illinois, have invented certain new anduseful Improvements in Friction-Clutches, of which the followingisaspecilication. l

The invention relates to clutches having a cylindrical casing withinwhich are arranged radially-movable friction-pieces adapted to beexpanded against and retracted from the casing for causing the membersto revolve together or freeing them so that one may remain idle whilethe other rotates; andthe object of the improvement is to providetoggle-joint mechanism in conjunction with screw appliances foroperating the friction-pieces. I have attained this object in the clutchconstructed as illustrated in the accompanying drawings, in which-Figure 1 represents a side elevation, partly in section, lof the clutchcontaining my invention. Fig. 2 is a section taken at right angles tothe plane of Fig'. l on the line 2 2. Fig. 3 is a section on the line 33 of Fig. 2, cutting the casing and showing the inner parts in elevationand representing the side opposite to that seen in Fig. 1. Fig. 4 is ahorizontal section taken on the line 4 4 of Fig. 3.

lnthe drawings, A is a shaft; B, the cylindrical casing mounted looselyon the shaft; C, Figs. 2 and 3, a hub lixed to rotate with the shaft byfeather and spline, but not to slide thereon; C', arms extending fromopposite sides of the hub; D, the friction-pieces, made in half-circularform to lit the interior of the casing, and D arms of saidfriction-pieces provided with a dovetail groove adapted to fit and slideon the arms C'. Other arms, C2, placed quartering to the arms C', areextended from the hub C, and on each of these is mounted a screw-shaftc, provided with a pinion c. v

E is a nut or sliding block threaded on each of the screw-shafts andrecessed to slide on the arm C2, as seen in Fig. 4. Links c, adapted toswivel in sockets at e, form a toggle-joint connection of the nuts withprojections on the friction-pieces, as illustrated in Figs. l and 2.

On the shaft is secured by featherand spline, so as to slide thereon, agrooved collar F, provided with rack-bars f, adapted to engage th'epinions c' when the groovedcollar is pushed in upon the hub C forrotating the screwshafts in the directionv required to move the nutsoutward and spread the links e, thus causing the friction-pieces toexpand against the interior of the casing to produce the necessaryfriction for causing the members of the clutch to rotate with the shaft.The reverse movement of the grooved collar will cause a reverse movementof said parts and relieve the friction, so as to break the continuity ofrotation of the casing with the shaft. The grooved collar is to beworked to and fro on the shaft by means of a split ring in its groove j,attached to a lever suitably mounted, all of ordinary pattern and notshown here because not deemed necessary.

The casing has a hub`B/, the inner end of which lits against the hub C,and a collar B, fixed to shaft A, keeps the casing in close but looseworking relation with hub C. The casing may be geared with any machinefor the transmission of its power thereto by means of a belt applied toits rim or hub or in any other well-known way.

When the grooved collar F is moved away from the hub C far enough tofree'the rackbars from connection with the pinions c', the latter may beturned by hand in order to ad- Vjust the friction-pieces in such closeworking relation with the flange-rim of the casing as to require onlyslight inward movement of the racksA upon the pinions to produce veryhigh friction between said parts.

Friction-clutches have been made with a shaft and cylindrical casinghaving an interior expanding and contracting clutch element inconnection with toggle-joint mechanism for expanding itandspring-actuated mechanism for retracting it; but such constructionsdo not contain my invention, which dispenses with spring-actuatedmechanism and affords means whereby a pinioned screw-shaft connectedwith the toggle-joint mechanism is connected with va reciprocatingelement in such manner as to operate said screw-shaft back and forth bythe power of a lever applied to said reciprocating element. This resultis attained by the sliding collar upon the shaft having a rack-barprojecting from the collar into the casing past said screw-shaft andengaging the pinion thereof', so as to control its movements back andf'orth for the purposes stated.

What is claimed isl. In a clutch a cylindrical casing and a pair of'spreading friction-pieces in combination with toggle-joint mechanisms inconnection With the friction-pieces, pinioned screw-shafts in connectionwith the toggle-joint mechanisms, and a sliding collar provided withrackbars adapted to work the screw-shaft pinions, as specified.

2. ln a clutch a cylindrical easing, a hub fixed to a shaft and providedwith a pair of' oppositely-extended radial arms, a pair of' segmentalfriction-pieces mounted to slide on said arms, a pair of' pinioned screw-shaf'ts mounted at opposite sides of' said hub and extended radiallythereto and perpendicular to said arms, a sliding' block threaded uponeach of said screw-shafts, links swiveled at one end to opposite sidesofl said sliding bloelis and at the other ends to the friction-pieces,and a sliding collar provided with rack-bars adapted to work thescrew-shaft pinions as specified.

3. ln a clutch of the class described the cembination with thefriction-pieces of a pair of pinioned screw-shafts arranged opposite tothe axis of rotation and extended radially7 thereto, a block threadedupon each of said screw-shafts, pivoted links extended from oppositesides of' each of' said blocks and connected with the friction-pieces,and a sliding collar having rack-bars adapted to engage 3 5 with thepinioned screw-shafts, as specified.

4. In a clutch, the combination with a eylindrical casing and pair of'friction-pieces, ofa pair of screw-shafts extended radially to the axisofl rotation, and each provided with a pin- 40 ion, a sliding' blockthreaded upon each of' said screw-shafts toward its outer end, linkspivotally connected with the sliding blocks and with thefriction-pieces, and a sliding collar provided with rack-bars arrangedto engage the pinions of' the screw-shafts, as specified.

5. In a clutch the combination with a shaft of' a cylindrical casing, anexpanding and contracting clutch element Within the easing, toggle-jointmechanism in connection with said clutch element, a pinioned screw-shaftcentrally connected with the toggle-joint mechanism, a sliding collarupon the shaft, and a rack-bar projecting from the sliding collar intothe casing and engaging with the pinion of the screw-shaft, asspecified.

ANDREW P. OLSON. fitnessesz MANCHA BRUGGED'IEYER, Unas. A. WATHIER.

